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This is a paid asset, but now you can easily download Highway Construction Set Free.
Highway Construction Set v1.2
This package contains a complete construction set for highway scenes.
It includes 41 modules for the road construction and 18 different types of signs.
This road comes with three different styles and elements to change between them.
The high-detailed parts of the modules have two levels of detail predefined.
Meshes for collision are also included.
Works with Unity 3, 4, 5, and 2018.